Mateusz Kozak

EMS architecture: when local control beats the cloud round trip

An EMS that round-trips every decision through the cloud is going to disappoint someone, eventually, in a way that costs real money. The right split between edge and cloud is a latency budget question, and once you frame it that way the architecture writes itself.

8 min read

MQTT at fleet scale: what a few thousand IoT devices and one bad Postgres password taught us

A misconfigured Postgres credential turned an ordinary EMQX cluster into a 50,000-connection-attempt-per-minute self-DDoS. Here is what we changed about authentication, observability, and runbook design after that night.

7 min read

The fractional CTO playbook: what four hours a week actually buys you

Four hours a week is enough to fix architecture, hiring, and roadmap if you spend it on the right things, and useless if you spend it reviewing pull requests.

6 min read

Green Energy in Europe: We Built It. Now Comes the Hard Part.

Sometime in 2025, Europe quietly crossed a line that would have been unimaginable a decade ago. Wind and solar generated more electricity

7 min read

Vertical Farming: Tech-driven solutions for sustainable food production

If you've spent any time in climate tech, you've probably noticed that energy and transport get most of

4 min read

EV Battery Innovations: Solid-state batteries and their commercial viability

tl;dr - Solid-state batteries have been "five years away" for a decade. In 2026, that's actually starting

6 min read

IoT in Energy Monitoring: Smart Meters and the Consumer Engagement Problem Nobody Talks About

We've been putting "smart" in front of "meter" for over a decade now. Utilities across Europe

4 min read

Building Decarbonization: Smart buildings and energy efficiency tech

tl;dr Buildings account for roughly 40% of global energy-related emissions. Most of that is operational - heating, cooling, lighting - and

8 min read

V2G Technology: How electric vehicles are becoming mobile power plants

EVs aren't just loads on the grid. With bidirectional charging, they're distributed storage - capable of supporting your

6 min read

Virtual Power Plants: Aggregating distributed energy resources

There's a quiet revolution happening on the grid. Millions of small energy assets - rooftop solar panels, home batteries, EV

5 min read

AI in Predictive Maintenance: Reducing downtime across industries

tl;dr: Every unplanned hour of downtime costs an auto plant roughly $1.3M. AI-driven monitoring can cut those surprise outages in

5 min read

We should use more energy*.

*...specifically, more clean energy - and more of it used well. We need to use more renewables. Not less electricity. More. I

3 min read